Elevating mechanism



Jan. 17, 1928.

C. W. MOORE ELEVATING MECHANISM Filed Jan. 27. 1926 4 Sheets-Sheet 1 f a5 a Z 4 M/ MW z J d I. i 96 a fi\ mke J ,7 W ki l (Ill! lll E a 5 i wmno v/v, v w m Jan. 17, 1928. 1,656,749

C W MOORE ELEVATING MECHANISM Filed Jan. 27. 1 926 4 Sheets-Shegt 2 64 ILi Jan. 17, 1928. 1,656,749

G W. MOORE ELEVATING MECHANISM Filed Jan. 27. 1926 4 Sheets-Sheet 3 Jam.17, 1928.

C. W. MOORE ELEVATING MECHANISM Filed Jan. 27. 1926 4 Sheets-Sheet 4 /J2Patented Jan. 17, 1928.

UNITED STATES PATENT GFFICE.

onnnn'a' I ararmrnornanve compan or Tron or PENNSYLVANIA.

on w. Moons, on nosnviv, rnnnsynvanm, asslou'on re ELECTED DENTALPHILADELPHIA, ENNSYLVA I a oonro m- ELEVATIN'G MECHANISM.

Application filed January 27, 1926; Serial No. 84,135.

My invention relates to elevating mecha nisin and it has particularapplication to such mechanisms as areapplicable to adjustable dental,surgical and barbcrchairs.

One object of my invention is to provide mechanism of the characterdescribed,

whereby a chair seat may be moved into a lower position than hasheretofore been considered practicable and the range of-movea ment ofthe chair simultaneously increased.

Another object of my invention istoprovide chair elevating mechanismthat shall be simple in designand construction, to lacilitatcassemblyott parts in group of subassen'iblies, highly etlicient inoperation, and characterized by the substantial absence of noise andvibration.

A. further object of my invention islo provide apparatus con'iprising asectional iblifliiig chair post, a movable support therefor and meansfor exerting a thrust on said post over substantially the lull lengththereof.

Other objects and applications of my in vention. as well as detailsofconstruction and operation, whereby my invention may be practiced,will be apparent more fully hereinafter, when taken in connection withthe accompanying drawings, wherein an Fl 1 is a side elevational view,partially in vertical section. of the elevating mechanism embodying myinvention with the chair seat in its highest position, the sectionalplane being on the line I-I of Fig. 3.

36 Fig. 2 is a similar view but illustrating the disposition of theelevating mechanism for the lowest positionof the chair seat;

Fig. 8 is a top plan view of the structure of Fig. 2; i in F i g. 4: isa vertical sectional view taken on the line IV-IV of Fig. 3;

Fig. 5 is a transverse sectional view taken on the line V-V of Fig. 4t;and a Fig. 6 is a horizontal sectional view taken on the line VI-VI ofFig. 1. 1 Referring to the embodiment of my invention shown in thedrawing. broadly speaking, a chair seat 1 mounted on an upper end 2 of ailolding sectional rack 3 on which may be actuated by a motor a. throughapertured to receive a plurality of adjustt mg screws 19 tor engagementwith a gib 21.

arcrhlction gear-wheel mechanism 5. The

,iolding rack or chair post 3 maybe slidably mounted on an upperdovetail guide 6 oija floating member 7, av lower dovetail guide 8 orwhich engages a stationary dovetail guide 55 ,9 of a casting 10 that isvertically positioned portions of the side edges and 16, to form sideflanges 17 and 18. The flange 18.1nay

Thegib 21. may be rigidly clamped to the vwall section 12 in the desiredadjusted position by means Off bolts 22.

As shown in Fig. 6. the dovetail slide or 4 guide 9- lits between theside ilange 17, the gih 21 and the side 13, and it maybe extendedvertically suliicientlyto guide the floating member 7 over itsdcsiredrange of travel, all as will presently appear. The 75 maximumupper posit-ion oi the floating member 7 is determinethas shown in Fig.1, by a pair of lugs 23 and 24: which are respectivelymounted on tilesupporting casting 10 .andthe side flange 17. The lower an 1103111101191the floating member 7 is as illustrated inFigsH2, tip stand 5.

Theupper dovetail slide or guide 6 may be forn ied as in the lower guide8 but on the opposite side 1% ofthe central wall see- SC tion 12 bytransversely bending the upper portions oi the side edges 15 and 16, andit alsois provided with a gib25 and, associated adjusting screws andclamping bolt- 26 and 27, respectively. 7 00 Thefolding chair post 3 isprovided with an upper section 28 having one side 29 in the form of adovetail adapted to fit the upper dovetail slide 6. The side 29 is alsoprovided with a slot 31 which receives one 05 end 32 0i anadjustableholt 33 supported bythe central wall section 12 at the upperendthereot. wherebythe chair post 3 may have a lost-motion connection tothe floating member 7. The length of the slot 31 is Fill sufficient topermit the desired independent movement of the chair post 3 and thereafter the simultaneous movement of the chair post 3 and the floatingmember 7 for reasons as will appear more fully herein after.

Another side 3st of the upper chair-post section 28 is provided withteeth constituting a rack 35. A lower end 36 ot' the upper section 28 isrecessed as shown in Figs. i

and 5 to receive an upper end 37 of a lower folding section 38 of thechair post 3. A pivot pin 39 serves to swingingly support the lower racksection 38 in position. A side l of the lower section 38 is alsoprovided with teeth constituting a rack 41 which is in alignment withthe upper rack section 35. The lower post section 38 is of reducedthickness with respect to the upper section 28 and it is provided with ashoe e2 on its underside 43 which slides over the adjacent portion ofthe side 14 as the chair post 3 moves relative to the floating nien'lber7. The shoe 42 further prevents a swinging i'novement of the lower racksection 38 toward the side le under conditions of operation, hereinafterset forth. a

The reduction gear-wheel mechanism between the driving motor i and thefolding chair post 3 includes a driving pinion H,

which is positioned to engage successively the rack section and 4-1 ofthe upper and lower chair-post sections 28 and 38. As shown particularlyin Fig. 5, the driving pinion 44 may be mounted on a horizontal shaftit") which is jonrnaled in bearings 46 and 47 formed in a verticallyextending casting 48 supported on the base plate 11. Vibration of theadjacent upper ends 49 and 51 ot the two castings 10 and i8 may beminimized by a pair of bolts 52 positioned illustrated in Fig. 3.

A gear-wheel 53 is mounted on one end oi the shaft and engages agear-wheel 5a which mounted on a second horizontal shaft 55 journaled inbearings 56 and 57 also formed in the casting -18. A worm wheel 58 ismounted on one end of the shaft 55 and engages a worm 59 mounted on ashaft 61 which is connected to the driving motor 4 through a flexiblecoupling The wormand-wheel 58-59 may be positioned in a recess 63 in thecasting 48 and further protected by means of a cover plate (not shown).The advantage of positioning the worm-and-wheel 58-59 in immediateproximity to the driving motor t is the decrease in the number of highspeed parts and therefore. the substantial elimination of noise andvibration.

As illustrated in Figs. 4 and 5, the base plate 11 is provided with arecess 6-1 for the lower rack section 38 when the chair post 3 is in itslower position. Movement of the lowor post section 38 to and from thefolded position may be facilitated by means of an anti-friction roller(55 which is mounted on an outer free end 66 oi said lower section 38.The base of the recess tti is termed to provide a lower track 67. uppertrack (58 may be formed by means of a rib 69 which is formed on thecasting -18, as shown in Fig. The upper track 68 may be extended into avertical section 71 by means of a plate T2 that is secured by bolts 73to lugs i i; of the casting ii). The vertical section Tl of the track incooperation with the antii riction roller (35 serves to prevent aswinging movement oi the lower post section 38 away from the floatingmember 7 when said lower portion 38 is engaged by the driving pinion iall as will presently appear.

A suming the several parts to be in the position illustrrued in l igs. 2to ll inclusive, the operation of the motor it causes the turning of thedriving pinion ii and hence the vertical movement of the upper raclc section iii oi? the chair post ii. The upper rack section 2%"; is guidedduring this movemeilt by the upper dovetail slide (3 oi the floatingmember T. The lower rack section 38 is guided at this time by theanti-'l'rictimi roller U5 and the tracks 67 and 68.

ll hon the anti-trictii'ni roller (55 has been moved around to thedot-and-dash line position shown in Fig. 1, the driving pinion lll hasactuated the upper rack section 28 vertically a distance suilicient tocause the lug 32 of the lost-motion connection to engage the lower endof the slot 81., so that a further movement of the chair post 25 causesalso a movement oil the lioating member 7. At this time the drivingpinion all moves from engagement with the rack 35 01' the up per postsection 28 into engagement with the rack ll of the lower section 38. Theline o'l action of the pinion thrust with resport to the pivot pin ill)is such that the lower post section Sit; tends to swing away from thelloating member 7, but this is prevented by the anti-triction roller(iii lu-uriug against the "vertical track section 71.

The contii'iued vertical movement oi the chair post 5 however causes theline of ac tion of the pinion thrust to move to the oppositc side oi thepivot pin :30 with the result that said lower post section lei'lds mi)now to swing toward the floating member '1'. but "hi is r ent l hv therho 42. Th s lis per cc u so 1: in desirable swinging movements oi thelower rack section are prevented. The vertical movement of the chairpost 25 under the action of the driving pinion H may be continued untilthe lug B t of the guiding meniher 7 moves into proximity to the lug 23of the guiding support 10, whereupon the driving motor l may betie-energized by trip mechanism (not shown). The parts are now in theposition illustrated in Fig. 1.

Vi hen the driving motor st is reversed, the

A complementary cycle of operations just described is reversed, thechair post 3 moving first downwardly simultaneously with the floatingmember 7 and thereafter independently thereof until i the parts againassume the position shown till in Figs. 4iand 5.

Should the gib 25 be so adjustedthat the friction between the floatingmember 7 and the upper raclr section 28 be greater than a desired value,then the operation of the drivii'ig pinion le'l, when the parts are inthe position illustrated in Figs. 4: and 5, causes the floating member 7tomove vertically simultaneously with the chair post section .28. Inorder that the lower rack sec tion 38 may be prevented from swingingtoward the floating member 7 under such eoiulitions, a lug 5 is providedon the lower end of the central wall section 12, so that it may engagethe adjacent side 43 of the lowerrack section 38 and guide the same asit moves vertically until the shoe a2 moves into contact with the sidell of the floating member 7. The lug 75 is so positioned relative to theshoe i? and the anti-friction wheel (35 as to be out of the path oftravel of the une.

l v hile I have shown only one embodiment of my invention, for thepurpose of describing the same and illustrating its principles ofconstruction and o aeration. it is apparent that various changes andmodifications may he made therein without departing from the spirit ofmy invention and I desire therefore that only such limitations shall beimposed thereon as are indicated in the appended claims or as aredemanded by the prior art.

1 claim:

3. Chair elevating mechanism comprising a sectional chair post movableinto a folded position and an extended position, float- 1g guiding meansfor said post operatively ocialed with at least one of said sections, lpost sections being provided with teeth constituting a racl-r, and adriving pinion in engagement with one section whensaid post is in old-edposition and another-section when said post is in its extended position.

2. A post having one end adapted to engage chair seat and provided witha hinged section at the other end, a floating guide for said post havinga lost-motion connection therewith, and a guide for said firstin'-i'itio1ieo guide, said hinged section under certain operating conditionsbeing movable into a position angularly disposed with respect to theremaining portion of said post.

3. Apparatus of the class described com prising a sectional chair posthaving a lower position wherein the sections are disposed in angularrelation, means for initially exerting a thrust on one section andthereafter on the other section, means for guidin said first-mentionedsection as it moves under the action of said thrust, saidsecond-mentioned means tioned 11183118 for actuating serving to supportsaid second-mensection as thethrust is exerted there on, and means forguiding said first-mentioned guiding means as it is actuated by saidchairpost.

A chair post having a predetermined path of travel, said chair posthaving a hinged section movable into an angular po sition when saidchair post approaches one end of its path oftraveha slide for said chairpost adapted to serve as a guide for said hinged section when said chairpost approaches the opposite end of its path of travel, and a slide forsaid first-mentioned slide.

hiApparatus of the character described .x-mprising a chair post having alower hinged section movable into an angular position when said post isat one end of its path of travel, a slide for said chair post having alost-motion connection therewith, said chair post, said hinged sectionbeing provided with means for guiding the same as it moves from saidfolded position, and a slide for said first mentioned slide.

6. A chair post having a lower hinged section movable into an angularposition when said post is at one end of its path of travel, a slide forsaid chair post having a lost-motion connection therewith, means foractuating said chair post, said hinged section being provided with meansfor guiding the same as it'moves from said folded position, and a slidefor said first-mentioned slide, said hinged section being guided by saidfirst-mentioned slide during a predetermined portion of its movement.

7. A member provided with a slide at one end, a sectional folding chairpost, of which one section has a lost-motion connection with said slide,the other section being guided by theopposite end of said slide whensaid chair post is in a predetermined position, a plurality of'teethformed on said chair post, and a pinion positloned to mesh with saidteeth, whereby said chair post may be moved independently of said slideand thereafter simultaneously therewith.

8. Chair elevating mechanism comprising a chair post having one sectionadapted to be secured to a chair and the other section swinginglymounted, a member having a slide adjacent to one end and having alostmotion connection to said first-mentioned chair post section, saidmember having asecond slide at the opposite end and on the opposite sidethereof, and a slide for said last-mentioncd slide.

9. In combination, a chair, a post having one section in supportingrelation to said chair and the other section swingingly mounted on saidfirst-mentioned section, a slidable support for said first-mentionedsection, said sections being provided with teeth ill) constituting arack, a pinion positioned to mesh with the teeth of said rack, means forpreventing a swinging movement of said second-mentioned section whensaid pinion engages the teeth thereof, and means for preventing theopposite swinging of said seeond-n'ientioned section when said pinionapproaches one end thereof.

10. In combination, a sectional folding chair post provided with teethconstituting a rack, a guide, at least one eeetion of said post and saidguide having interlocking dovetail portions, and :1 second guide, thelatter and said first guide having interim-1e mg dovetail portions.

CLARENCE VJ. MOORE.

